I did - and it was the same fix as my daughter's 500.
I had to disconnect the Blue&Me unit that's behind the plastic panel in the rear passenger seat (near side) - it's not that difficult to get to, if you Google you should be able to find some YouTube vids showing how to gain access. But if I recall I had to use a socket set to take the top seat belt fixing, then pop off that panel and then the side panel. I didn't remove the unit so all I needed to do was to be able to reach behind and disconnect the cable - there was a trick to that which I can't recall.
Some vids remove the rear seat, but I did the bare minimum to gain access.

But once you've done that you need do a proxy alignment to tell the ECU to forget that unit (I'm assuming here that you don't want to replace it - there are sites that exchange those units). I followed this guy:


Note you do have to buy some software and some cables unfortunately - he covers all of that in the video - but the key point for me at least, was that I used the same software and cable (the yellow iDiagnostics from here: https://idiagnostics.co.uk/product/36 - but check that's correct for your Ka) as they are essentially the same car under the skin.


I should add - probably best to try this first: there's a red 10 amp fuse in the passenger glove box that protects the ratio and some other components. If you take that out with some long-nosed pliars and the battery doesn't drain, it's a fair bet it's the Blue&Me unit which have a tendency to cause the drain.


It took me quite a while to work that all out from various forums - so I hope that gives you a head start. Good luck!

Matt